1UA top end rebuild questions

[chappers]

Hi,

I've taken the head off my siezed 1ua to find that the head looks fine and there are no holes in pistons

The Haynes manual says that you can take the barrells off with the engine in the frame but I can't see how I can do this as 1. the two screws holding the powervalve together have been changed for allen bolts and my allen keys (correct size) are spinning in the bolt. It's also difficult to get any purchase on them due to where thet are and size/shape of allen keys.
2. The bolts holding the head down seem to have been tightened by conan the barbarian. I can get the ones off that are easily accessible but the ones near the exhaust ports seem pretty stuck and there's not much room to get a swing at a hamme on a spanner.

So, do I need to remove the engine and if I do, is this likely to help?

Also, how do I torque the bolts back up on the head? It doesn't look possible to get a socket onto the head bolts due to the shape of the head in most places. If I can't torque them, how much force do I need to use to put them back on (if I ever get 'em off!)?

I can see the rings on the pistons and they look to be either missing or fused into the piston. If missing I'll need to remove the engine anyway and check out the crank case I guess but if just fused in, has anybody got any ideas what is likely to have caused the seizure?

I'm running a zeel ignition system with dyna coils and am wondering if the timing on the zeel might have caused it, or does it sounds like an oil pump issue? If the latter, any tips on testing the oil pump?

Thanks for your thoughts.

Paul

[rdstars]

Once the barrels are loose you can slide them both up and once one is over the lower piston it will slide away from the PV Joint.

Torque the head with a 3/8 Torque Wrench, the head is numbered in the right sequence.

[rdstars]

When you say the Head Bolts stuck,,,,

Do you mean the socket is slipping rounding the head bolt or its just to tight.

Make sure you got a half decent socket set and any job should be easy enough, a 3/8 power bar with a socket should undo any head bolt.

Also it says you have the head off already so a little lost.

[rdstars]

Another option is to pull the motor out, should take half hour then its on the bench

[chappers]

Thanks for the replies.

Apologies for the confusion, I was referring to the barrel bolts which don't look like you can get a socket on. As headcoats said, I have tried using a ring spanner on the exhaust ones but they're still solid. If I can't get a socket on them I'm not sure how tight to put them back on. I like to use a torque wrench when possible as I have a tendency to overtighten

I was trying to avoid taking the engine out as I'm doing it on my own so not sure how easy/heavy it is to get out. I've now got carbs etc. off so not too much left to go to take it out I guess.

I also have a bad habit of taking bikes to bits then not putting them back together. I think I've got to bite the bullet though.

Cheers

Paul

[rdstars]

If it is to tight but not slipping with a ring spanner on the nut you can use another spanner over the open end, two spanners together giving you more leverage.

To torque them down you can get a tool to go on them and then use a torque wrench, I never bothered. Back in my apprentice days I had a habit of doing threads in and over tighten things so I tend to use 1/4 drive sockets and shorter spanners.

I managed to pull a motor out on my own, it is quite heavy but an average bloke should manage. What part of the UK are you, maybe there is a member local could drop by give hand.

[mellow]

i recently had mine out on my own m8.if a skinny short t**t like me can lift it out im sure u can
I also used a spanner over the end of another to undo and do up the barrel nuts.its the only way
As for the powervalve joint,take the pulley off the end,turn the valves so the allen keys face forward,stick ur allen key in and use a spanner on the end of that too.separated barrels